Benewabi



l. M. COOTE.

RENEWABLE KNIFE BLADE FUSE.

APrucmoN mio omai. i911.

1,308,000. n PatendJune 24,1919.

J//laxwe/l w@ UNITED sTATEs PATENT OFFICE. i JOHN cooTE, or NEW Armar. i

To all whom z't may concern.'

Be it known that I, Jox-IN MAXWELL a citizen o f theUnited States, and a resident of Elizabeth, in the county of Union and State of New Jersey, haveinvented certain new and useful Improvements in Renewable Knife-Blade Fuses, of which the following is a specification.

The invention relates to improvements 1n electrical fuses, more particularly of the knife-blade type wherein a fusiblewire `or link is held within a suitable shell or protecting covering by means of a carrier having two protruding contact blades, sald carrier being suitably secured to the shell. :The present invention has for its object to provide a fuse of this character wherein the said fusible element may be inexpensively and readily replaced in case the same is blown by excessive current, and to provide a substantial construction of few and simple parts whereby rigidity of the contact blades will be insured.

The nature of the invention will be best` understood when described in connection withA the accompanying drawings, in Which- Figure 1 illustrates the improved knifeblade fuse in elevation.

Fig. 2 is a horizontal section therethrough. Fig. 3 is an end view with cap removed. Fig. 4 is shell.

Fig. 5 isan elevation of the fuse 4and of the contact elements constitutin the carrier therefor, the inclosing shell an caps being removed."

Fig. 6 is a plan of the locking member or washer.

Fig. 7 Fig. 6. v

Fig. 8 is a section taken on the line 88,

is a section taken on the line 7- 7,

imilar characters of reference designate ,corresponding parts throughout the several views.

Referring tothe drawings, l0-designates `the inclosing shell usually tubular in forml and of insulatin material, the same being exteriorly threa ed at each end to recelve caps-or ferrules 11 and 12 whichv assistin retaining thel fuse carrier to the said shell.

This carrier comprises two thin strips or blades 13 and 14v provided with intermediate flanges or thin dlsks 15 and 1'6 having vents 17 to permit of the escape of the gases re` Speciileation o1. Letters Patent.

Application led December 31, 1917. Serial lo. 209,650.

an elevation of the inclosingl Patented June 24, 1919.

sulting from the blowing ofthe fuse. The I plane of the blade, extend inwardly from said shoulder and fit corresponding notches 20 of the particularend of said shell. The

cap 11 for this end of the shell fits over the disk 15. and has an inwardly-directed circular flange 21 which serves to coact with said disk to 'hold the same firmly-to the end of the shell 10.

They other disk 16 is 0f lesser diameter than the internal diameter of said shell in order to permit the carrier to be `forced throu h the shellwhen the said carrier is.

assem led, as shown in Fig. 5 of the drawings, that is to say, when the fusible link or wire `22 is secured in position `at the inner ends of the blades 18 and 14. These links are of predetermined length, preferably of round Wire with iattened'termlnals, and are held to the inner ends of the blades by suitable means, for example bolts 23 and nuts 24 Vwith suitable washers 25 interposed. This fuse unit, comprising the blades 13 and 14 held in spaced relationship by the link, may thus be handled as a whole and be inserted into the shell 10 and. retained at the one end 13, as aforesaid. If desired, asuitable filler (not shown), su chas asbestos or lime, may surround the said link.

To locate the other blade end 14 and insure rlgidity of same with reference to the vshell 10, the disk 16 thereof is caused to be from one end substantiall; through the said washer, is arranged, furt ermore, to be fitted by means of said slot over the inner por- `tion of the blade 14 and .between the diskend of the shell 16 and the correspondin 10. This washer is provided with vents 28 registering with, when the washer is in locking position, the corresponding vents of the disk 16. lThe said washer, moreover, in

- cally-disposed lugs 19, vfor example in the i order to prevent rotational movement of the i shell 10 relatively thereto, is provided with 11-0 a lug 29 directed inwardly from its circumference and ittinga corresponding notch 30 of the end of' the shell. This lu is located preferably at the closed end of t e slot, and at the other open end thereof further lugs 3l are directed downwardly from the sides of the slot to coaet with the opposite sides 32 of a notch 33 of the end of said shell. The washer is thus fixed with respect not only to the blade .14, but also with reference to the shell 10, whereby rigidity of the va rious parts is insured. To further insure this rigidity and to present a finished appearance to the fuse, the disk 16, which is preferably in the form of a truncated cone, is designed to coact with the inwardly-projecting flange 34 of the cap 12 which 1s correspondingly tapered on its inner face so that, when the same is screwed down over the end of the shell 10. the parts are further bound and held in place.

I claim:

1. A renewable knife-blade fuse, comprising: two oppositely-disposed blade contact members; a fusible element secured to same; a shell inclosing said fusible element and portions of said blade contact members; a member slotted to receive one ofthe blade Contact members to aline samev and secure both to the shell; and caps fitting over the blade contact membersI and ends of said shell.

2. A renewable knife-blade fuse, comprising: two oppositely-disposed blade contact members; a fusible element secured to same; a shell inclosing said-fusible element and portions of said blade contact members, said shell beingy notched at one end; a removable disk slotted to receive one of the blade contact members to aline the same and secure both to the shell, said disk having lugs fitting the said notches to prevent rotational movement between said shell and blade contact members; and caps fitting over the blade contact members and ends of said shell..

3. A renewable knife-blade fuse, comprising: two oppositely-disposed blade conta-ct members provided with integral flanges intermediate their ends, one flange being of greater diameter than the other; a fusible element secured to said contact members; an inclosing shell through which the flange of lesser diameter is adapted to pass, the fiange of greater diameter abutting an end of said shell; and removable means inserted between the Hangs of lesser diameter and the. other end of the shell to lock the contact membersy to the shell.

4. A renewable knife-blade fuse, comprising: two oppositely-disposed blade contact members provided with integral fianges intermediate their ends,lsaid flanges having suitable vents, and one flange being of greater diameter than the other; afusible element secured to said contact members; an inclosing shell through which" the flange V`of lesser diameter is adapted to pass, the

flange of greater diameter abutting an end of said shell; and removable means inserted between the flange of lesser diameter and the other end of the shellto lock the contact members to the shell.

5. A renewable knife-blade fuse, comprising two oppositely-disposed blade contact members provided with integral flanges intermediate their ends, one flange being of greater diameter vthan the other; a fusible element secured to said contact members; an inclosing shell through which the flange of lesser diameter is adapted to pass, the fiange of greater diameter abutting an end of said shell; removable means inserted between the flangeof lesser diameter and the other end of the shell to lock the contact members to the shell; and caps fitting over the blade contact members and the ends of said shell and further securing the contact members to the shell. 6. A renewable knife-blade fuse,'compris ing: two oppositely-disposed blade contact members provided with integral flanges intermediate their ends, one flange being of greaterl diameter than the other; a fusible element secured to said contact members; an inclosing shell .through which the flange of lesser diameter is adapted to pass, the flange of greater diameter abutting an end of said shell; and a circular disk member fitted between the flange of lesser diameter and the corresponding end of the shell to lock the contact members to the shell. 7 A renewable knife-blade fuse, comprising: two oppositely-disposed blade contact 100 members provided with integral fianges intermediate their ends, one flange being of greater diameter than theother; a fusible element secured to said contact members; an inelosing shell through which the flange of lesser diameter is adapted to pass, the fiange of greater diameter abutting an end of said shell; and a circulardisk member fitted between thel fiange of lesser diameter and the corresponding end of the shell to lock the contact members to the shell, said disk member being .provided with a diametral slot extending inwardly from the circumference to receive the corresponding contact blade.

8. A renewable knife-blade fuse, comprising: two oppositely-disposed blade contact members provided with integral flanges i-ntermediate Atheir ends, said flanges having ,suitable vents, and one flange being of greater diameter than the other; a fusible .120 element. secured to said contact members;

an inclosing shell through which ,the flange of leer` diameter is adapted to pass, the

flange of greater diameter abutting an end of said shell; and removable meansinserted between the fia. e of lesser diameter and the other end of e shell to lock the Contact members to the shell, and provided with vents registering with the vents of the flange oflesser diameter. A

is adapted to pass, the flange of ter diameter abutting an end of said she l; and a circular disk member fitted between the flange of lesser diameter and the corresponding end of the shelllto lock the contact members to the shell, said diskv member being provided with a diametral slot extending inwardly from the circumference to receive the correspondin contact blade, and with inwardly-exten ing lugs fitting the notches of the correspondin end of the shell.

10. A renewab e knife-blade fuse comprising: two oppositel -disposed bla e contact members provide with integral flanges intermediate their ends, one flange bein of greater diameter-than the other; a fusible element secured to said contact members; an inclosing shell notched at one end, and

through which the flange of lesser diameter alo is adapted to pass, the flange of ater diameter abutting an end of said she 1; and a circular disk member fitted between the flange of lesser diameter and the corresponding end of the shell to lock the contact members to the shell, said disk member being provided with a diametral slot extending incircumference of said disk at the closed end of said slot andl with inwardly-extending lugs located substantially at the clrcumference of -said disk at opposite ends of the entrance portion of the slot thereof, said Afirst-named lug engaging the notch provided in the correspondm end of the shell, and the last-named two ugs the opposite sides of the corres ending notch provided in the end ofA said s ell.

11. vA renewable knife-blade fuse comprising: two oppositely-disposed bla e contact members rovided with integral flanges intermediate their-ends, one flange bein of greaterl diameter than the other; a fusible element secured to said contact members; an

.inclosing shell notched at one end and through which the flange of leer diameter is adapted to pass, the flange of ter diameter abutting an end of said she l, and having inwardly-extending lugs fitting" the corresponding notches provided in the end of the shell; and removable means inserted between the .flange of lesser diameter and the other end of the shell to lock the contact members to .the shell.

Signed at New York, in the county of New York and State of New York, this 27th day of December, VA. D. 1917. s

' J. MAXWELL vcoorrn. 

